public class Student implements Comparable<Student> {
    public String name;
    public  int age;
    public  Student(String name,int age){
        this.name=name;
        this.age=age;
    }

    @Override
    public int compareTo(Student o) {
        return this.age-o.age;
    }

    @Override
    public String toString() {
        return "Student{" +
                "name='" + name + '\'' +
                ", age=" + age +
                '}';
    }
}
